/*
GanttProject is an opensource project management tool.
Copyright (C) 2002-2011 Dmitry Barashev, GanttProject Team

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/
package net.sourceforge.ganttproject.action.task;

import java.util.List;

import net.sourceforge.ganttproject.GanttTree2;
import net.sourceforge.ganttproject.gui.UIFacade;
import net.sourceforge.ganttproject.task.Task;
import net.sourceforge.ganttproject.task.TaskContainmentHierarchyFacade;
import net.sourceforge.ganttproject.task.TaskManager;
import net.sourceforge.ganttproject.task.TaskSelectionManager;

/**
 * Unindent several nodes that are selected
 */
public class TaskUnindentAction extends TaskActionBase {

    public TaskUnindentAction(TaskManager taskManager, TaskSelectionManager selectionManager, UIFacade uiFacade,
            GanttTree2 tree) {
        super("task.unindent", taskManager, selectionManager, uiFacade, tree);
    }

    @Override
    protected String getIconFilePrefix() {
        return "unindent_";
    }

    @Override
    protected boolean isEnabled(List<Task> selection) {
        if(selection.size() == 0) {
            return false;
        }

        TaskContainmentHierarchyFacade taskHierarchy = getTaskManager().getTaskHierarchy();
        Task rootTask = taskHierarchy.getRootTask();
        for(Task task: selection) {
            if(rootTask.equals(taskHierarchy.getContainer(task))) {
                // Found a task which cannot get unindented
                return false;
            }
        }
        return true;
    }

    @Override
    protected void run(List<Task> selection) throws Exception {
        TaskContainmentHierarchyFacade taskHierarchy = getTaskManager().getTaskHierarchy();
        for(int i = selection.size() - 1; i >= 0 ; i--) {
            // Place task at ancestor children right after parent
            Task task = selection.get(i);
            Task parent = taskHierarchy.getContainer(task);
            Task ancestor = taskHierarchy.getContainer(parent);
            int index = taskHierarchy.getTaskIndex(parent) + 1;
            taskHierarchy.move(task, ancestor, index);
        }
        forwardScheduling();
    }
}
